The effects of free stream turbulence on the hydrodynamic characteristics of an AUV hull form

Mitra, A.; Panda, J. P.; Warrior, Hari

doi:10.1016/j.oceaneng.2019.01.039

Cited by 47 publications

(20 citation statements)

References 46 publications

(62 reference statements)

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“…From all the figures it is observed that the pressure strain correlation model with the wall reflection term well predicts the flow field. The wall reflection term accurately captures the modified pressure field in the proximity of the rigid AUV wall and impedes the transfer of energy from the stream wise direction to that normal to the wall as reported in [22].…”

Section: Validation Of the Numerical Modelmentioning

confidence: 94%

“…The experiments were conducted in a recirculating water channel at the department of Ocean Engineering the hemispheres is equal to the diameter of the cylinder. The shape of the AUV hull in this work is based on the geometrical configuration investigated in [3,22]. In this work we mainly have studied the effect of bed slope on the hydrodynamic performance of the AUV, so other accessories such as fins and propeller are not conneteced with the AUV hull.…”

Section: Methodsmentioning

confidence: 99%

“…(c) Detailed dimensions of AUV and wedge Experimental setup in the recirculating water tank, the arrow marks represents the flow direction, the AUV was fixed at the central line of water tank at a distance of 0.15 meter from the beginning of the wedge.Figure 2ais reproduced from[22] The electrical control unit for controlling the RPM of the pump.…”

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confidence: 99%

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Experimental and numerical investigation of the hydrodynamic characteristics of Autonomous Underwater Vehicles over sea-beds with complex topography

2020

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Improved designs for Autonomous Underwater Vehicles (AUV) are becoming increasingly important due to their utility in academic and industrial applications. However, a majority of such testing and design is carried out under conditions that may not reflect the operating environment of shallow water AUVs. This may lead to imprecise estimations of the AUV's performance and sub-optimal designs. This article presents experimental and numerical studies carried out in conjunction, to investigate the hydrodynamic characteristics of AUV hulls at different Reynolds numbers over sloped channel-beds. We carry out experiments to measure the velocity field and turbulent statistics around the AUV with quantified uncertainty. These are contrasted against corresponding flat bed experiments to gauge the effect of test bed topography on AUV performance.The experimental data was used to validate Reynolds Stress Model predictions. Hydrodynamic parameters such as drag, pressure and skin friction coefficients were predicted from the RSM simulations at different test bed slopes, angles of attack and drift angles of the AUV hull, to analyze the hydrodynamic performance of the AUV. The results presented in this article offer avenues for design improvement of AUVs operating in shallow environments, such as the continental slope and estuaries.The exploration of ocean and to interpret its underwater behavior is of importance in todays world. To examine the ocean bed, convenient accessories are required to minimize the presence of human operators underneath of ocean. Autonomous Underwater Vehicles (AUV) are automated vehicles that are capable of underwater locomotion. These have applications in a variety of fields. For example, in the commercial field, oil and sub-sea drilling companies use AUVs for the purpose of checking the appropriate oceanic area where drilling may be optimally beneficial. For research and exploration, AUVs are used to track reefs and other life-forms that exist underwater. Additionally, AUVs have found applications in military and academic fields as well, besides others[1].The initial AUV designs were just modifications on existing designs of submersible torpedoes [2]. However, with the new found applications of these vehicles, focused investigation into their optimal design have become more critical. For instance, there is a demand for AUVs that can execute missions of the order of weeks and months. This requires that the AUV design be as optimal as possible, necessitating a careful analysis of the hydrodynamic performance of the AUV structure. Several experimental and numerical studies are available in the literature to analyze the hydrodynamic parameters around AUVs [3,4,5,6,7,8,9,10,11,12,13,14,15].Mansoorzadeh and Javanmard [3] have studied the effect of free surface on drag and lift coefficients of AUV at different submergence depths and compared the experimental data with the computational fluid dynamics (CFD) simulations. It was observed that hydrodynamic coefficients were very much responsive to the submergence...

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Section: Validation Of the Numerical Modelmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

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Experimental and numerical investigation of the hydrodynamic characteristics of Autonomous Underwater Vehicles over sea-beds with complex topography

2020

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“…Oceanic flows are highly turbulent. Mitra et al 40 have studied the effects of free-stream turbulence on the hydrodynamic characteristics of AUV. A series of experiments and CFD simulations were conducted to study the effects of free-stream turbulence on the evolution of the drag, skin friction, and pressure coefficients of the AUV.…”

Section: The Hydrodynamics Of Auv Operating In Complex Flow Fieldsmentioning

confidence: 99%

“…In the present scenario, with an increase in computational facilities, researchers can use those models for prediction 3D flow past AUV. Mitra et al 40 have used such models to analyze the hydrodynamic parameters of AUV in the presence of free-stream turbulence and over sea-beds with complex topography. Very limited literature is available on the analysis of hydrodynamic parameters of AUV using large-eddy simulations.…”

Section: Turbulence Models For Hydrodynamic Analysis Of Auvmentioning

confidence: 99%

A review on the hydrodynamic characteristics of autonomous underwater vehicles

Panda

Mitra

Warrior

2020

Proceedings of the Institution of Mechanical Engineers, Part M:

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Autonomous underwater vehicles play an essential role in geophysical data collection, deep water mining, seafloor mapping, ocean exploration, and in many other related activities starting from military to scientific applications. A detailed understanding of hydrodynamic characteristics will lead to better design, better control, and optimal path planning of autonomous underwater vehicles in the deepest corner of oceans. This article will provide a detailed review of the hydrodynamic characteristics of autonomous underwater vehicles, starting from different experimental techniques used in the analysis of hydrodynamic parameters, methods used for fixing the autonomous underwater vehicles in towing tank, instruments used for measurement of the hydrodynamic parameters. Furthermore, numerical methods employed in performing computational analysis, hydrodynamics-based shape optimization, studies on drag reduction, and finally a detailed list of turbulence models used in the computational fluid dynamics–related numerical simulations. The hydrodynamics-based optimal shape of the autonomous underwater vehicles, the best technique to predict the hydrodynamic parameters, and the best turbulence model for the computational fluid dynamics–based prediction of hydrodynamic parameters will be recommended. At last, the hydrodynamic characteristics of different bio-inspired autonomous underwater vehicles are discussed.

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